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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.35 = 1-(10/x) // - 1-(10/x)
10/x-1+0.35 = 0
10*x^-1 = 0.65 // : 10
x^-1 = 0.065
-1 < 0
1/(x^1) = 0.065 // * x^1
1 = 0.065*x^1 // : 0.065
15.38461538 = x^1
x = 15.38461538
x = 15.38461538
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